H3C Technologies H3C S3100V2 Series Switches - Manual (Page 79)

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To do... Use the command... Remarks
Enter VLAN view vlan vlan-id —
Enable the MLD snooping querier mld-snooping querier
Required
Disabled by default
NOTE:
It is meaningless to configure an MLD snooping querier in an IPv6 multicast network running MLD.
Although an MLD snooping querier does not take part in MLD querier elections, it might affect MLD
querier elections because it sends MLD general queries with a low source IPv6 address.
Configuring MLD queries and responses
You can tune the MLD general query interval based on the actual condition of the network.
Upon receiving an MLD query—general query or multicast-address-specific query, a host starts a timer
for each IPv6 multicast group that it has joined. This timer is initialized to a random value in the range of
0 to the maximum response time—the host obtains the value of the maximum response time from the Max
Response Time field in the MLD query that it received. When the timer value comes down to 0, the host
sends an MLD report to the corresponding IPv6 multicast group.
An appropriate setting of the maximum response time for MLD queries enables hosts to respond to
queries quickly and avoids bursts of MLD traffic on the network. Such burst can occur when a large
number of hosts simultaneously send reports after the corresponding timers expire simultaneously.
• For MLD general queries, configure the maximum response time to fill their Max Response time
field.
• For MLD multicast-address-specific queries, configure the MLD last-member query interval to fill their
Max Response time field. Namely, for MLD multicast-address-specific queries, the maximum
response time equals the MLD last-member query interval.
Configuring MLD queries and responses globally
Follow these steps to configure MLD queries and responses globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter MLD snooping view mld-snooping —
Configure the maximum response
time for MLD general queries
max-response-time interval
Optional
10 seconds by default
Configure the MLD last-member
query interval
last-listener-query-interval interval
Optional
1 second by default
Configuring MLD queries and responses in a VLAN
Follow these steps to configure MLD queries and responses in a VLAN
To do... Use the command... Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —